Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net										$ 5,730	$ 7,694	$ 893
Operating expenses										(2,311,145)	(2,220,326)	(2,034,922)
Net income		$ (131,274)	$ (55,925)	$ (103,275)	$ (28,887)	$ (95,228)	$ (47,532)	$ (53,024)	$ (55,939)	(319,361)	$ (251,723)	$ (339,523)
Amount reclassified from Accumulated other comprehensive loss, net of tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income										13,197
Amount reclassified from Accumulated other comprehensive loss, net of tax | Unrealized net loss on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense, net										170
Amount reclassified from Accumulated other comprehensive loss, net of tax | Unrealized net loss on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses	[1]									$ 13,027

[1] Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.